/* Shared site navigation drawer */

.nav-drawer-toggle {
    list-style: none;
    width: 2rem;
    height: 2rem;
    border: 1px solid var(--border, var(--line, #dddddd));
    border-radius: 9px;
    background: var(--bg-secondary, var(--surface-soft, #ffffff));
    color: var(--text-primary, var(--text, #222));
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    margin-top: 0.15rem;
    transition:
        background 0.2s ease,
        transform 0.2s cubic-bezier(0.22, 1, 0.36, 1),
        border-color 0.2s ease;
}

.nav-drawer-toggle:hover {
    background: color-mix(in srgb, var(--bg-secondary, #ffffff) 88%, #d9e3eb 12%);
}

.nav-drawer-toggle.is-open {
    transform: translateY(1px);
}

.nav-drawer-toggle .burger-icon {
    display: inline-grid;
    gap: 0.18rem;
}

.nav-drawer-toggle .burger-icon span {
    display: block;
    width: 0.9rem;
    height: 2px;
    background: currentColor;
    border-radius: 99px;
    transform-origin: center;
    transition:
        transform 0.28s cubic-bezier(0.22, 1, 0.36, 1),
        opacity 0.2s ease;
}

.nav-drawer-toggle.is-open .burger-icon span:nth-child(1) {
    transform: translateY(calc(2px + 0.18rem)) rotate(45deg);
}

.nav-drawer-toggle.is-open .burger-icon span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0.4);
}

.nav-drawer-toggle.is-open .burger-icon span:nth-child(3) {
    transform: translateY(calc(-2px - 0.18rem)) rotate(-45deg);
}

body.nav-drawer-open {
    overflow: hidden;
}

/* Keep the header (and burger) above the drawer, YouTube-style */
body.nav-drawer-open .topbar {
    z-index: 230;
    transform: none;
}

.nav-drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(12, 16, 22, 0.42);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.28s ease;
}

.nav-drawer-backdrop.is-visible {
    opacity: 1;
    pointer-events: auto;
}

.nav-drawer {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 210;
    width: min(320px, calc(100vw - 2.5rem));
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    /* Sit under the topbar; padding clears the bar so content isn’t covered */
    padding: calc(var(--header-offset, 92px) - 6px) 0.85rem 1.25rem;
    background: var(--bg-secondary, var(--card, #ffffff));
    color: var(--text-primary, var(--text, #222));
    border-right: 1px solid var(--border, var(--line, #dddddd));
    box-shadow: 12px 0 40px rgba(0, 0, 0, 0.18);
    transform: translateX(-104%);
    visibility: hidden;
    transition:
        transform 0.32s cubic-bezier(0.22, 1, 0.36, 1),
        visibility 0.32s;
}

.nav-drawer.is-open {
    transform: translateX(0);
    visibility: visible;
}

.nav-drawer-nav {
    display: grid;
    gap: 0.35rem;
    align-content: start;
    overflow-x: hidden;
    overflow-y: auto;
    min-height: 0;
    flex: 1 1 auto;
}

.nav-drawer-link {
    display: block;
    text-decoration: none;
    color: inherit;
    font-family: "Manrope", "Segoe UI", sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.55rem 0.65rem;
    border-radius: 10px;
    border: 1px solid transparent;
    transition:
        background 0.16s ease,
        border-color 0.16s ease,
        color 0.16s ease;
}

.nav-drawer-link:hover {
    background: color-mix(in srgb, var(--bg-primary, #f4f4f4) 70%, transparent);
    border-color: var(--border, var(--line, #dddddd));
}

.nav-drawer-link[aria-current="page"],
.nav-drawer-link-parent.is-section-active {
    color: var(--accent, #115c8d);
}

.nav-drawer-link[aria-current="page"] {
    background: color-mix(in srgb, var(--accent, #115c8d) 12%, transparent);
    border-color: color-mix(in srgb, var(--accent, #115c8d) 35%, transparent);
}

.nav-drawer-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.15rem;
    align-items: center;
}

.nav-drawer-row .nav-drawer-link-parent {
    min-width: 0;
}

.nav-drawer-chevron {
    width: 2rem;
    height: 2rem;
    border: 0;
    border-radius: 9px;
    background: transparent;
    color: inherit;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0.72;
    transition:
        transform 0.22s cubic-bezier(0.22, 1, 0.36, 1),
        background 0.16s ease,
        opacity 0.16s ease;
}

.nav-drawer-chevron:hover {
    opacity: 1;
    background: color-mix(in srgb, var(--bg-primary, #f4f4f4) 70%, transparent);
}

.nav-drawer-group.is-open > .nav-drawer-row .nav-drawer-chevron {
    transform: rotate(180deg);
}

.nav-drawer-sub {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav-drawer-group.is-open > .nav-drawer-sub {
    grid-template-rows: 1fr;
}

.nav-drawer-sub-inner {
    overflow: hidden;
    display: grid;
    gap: 0.15rem;
    padding: 0.15rem 0 0.25rem 0.55rem;
    margin-left: 0.35rem;
    border-left: 1px solid var(--border, var(--line, #dddddd));
}

.nav-drawer-link-child {
    font-size: 0.88rem;
    font-weight: 500;
    padding: 0.42rem 0.6rem;
    color: var(--text-secondary, var(--muted, #666));
}

.nav-drawer-link-child:hover,
.nav-drawer-link-child[aria-current="page"] {
    color: var(--text-primary, var(--text, #222));
}

.nav-drawer-group-nested {
    margin: 0.05rem 0;
}

.nav-drawer-group-nested > .nav-drawer-row .nav-drawer-link-parent {
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary, var(--muted, #666));
}

.nav-drawer-group-nested > .nav-drawer-row .nav-drawer-link-parent.is-section-active,
.nav-drawer-group-nested > .nav-drawer-row .nav-drawer-link-parent:hover {
    color: var(--text-primary, var(--text, #222));
}

.nav-drawer-group-nested > .nav-drawer-sub > .nav-drawer-sub-inner {
    padding-left: 0.45rem;
    margin-left: 0.25rem;
}

.nav-drawer-group-nested .nav-drawer-link-child {
    font-size: 0.82rem;
    padding: 0.36rem 0.55rem;
}

.nav-drawer-group-nested > .nav-drawer-row .nav-drawer-chevron {
    width: 1.75rem;
    height: 1.75rem;
}

@media (prefers-reduced-motion: reduce) {
    .nav-drawer,
    .nav-drawer-backdrop,
    .nav-drawer-toggle,
    .nav-drawer-toggle .burger-icon span,
    .nav-drawer-chevron,
    .nav-drawer-sub,
    .nav-drawer-link {
        transition: none !important;
    }
}